今天，我们来一起学习一下如何把元素添加到元素的首个元素。
1.Array.unshift()
letfruits=[\"Apple\",\"Banana\",\"Mango\"];fruits.unshift(\"Orange\");console.log(fruits);//Prints[\"Orange\",\"Apple\",\"Banana\",\"Mango\"]fruits.unshift(\"Guava\",\"Papaya\");console.log(fruits);//Prints[\"Guava\",\"Papaya\",\"Orange\",\"Apple\",\"Banana\",\"Mango\"]2.使用展开运算符(…)
varfruits=[\"Apple\",\"Banana\",\"Mango\"];varmoreFruits=[\"Orange\",...fruits];console.log(moreFruits);//Prints[\"Orange\",\"Apple\",\"Banana\",\"Mango\"]varsomeoMoreFruits=[\"Guava\",\"Papaya\",...moreFruits];console.log(someoMoreFruits);//Prints[\"Guava\",\"Papaya\",\"Orange\",\"Apple\",\"Banana\",\"Mango\"]console.log(fruits);//Prints[\"Apple\",\"Banana\",\"Mango\"]3.使用 Array.concat()
我们还可以使用concat()方法在开头连接两个(或更多)数组。
varfruits=[\"Apple\",\"Banana\",\"Mango\"];varmoreFruits=[\"Orange\"];varsomeoMoreFruits=[\"Guava\",\"Papaya\"];varallFruits=someoMoreFruits.concat(moreFruits,fruits);console.log(allFruits);//Prints[\"Guava\",\"Papaya\",\"Orange\",\"Apple\",\"Banana\",\"Mango\"]完~我是小智，我要去刷碗了，我们下期再见~
